Study of the Mechanical Properties and Microstructure of Spiral Tubes and Actuators for Controlled Extension Fabricated with Beryllium Bronze Strips
QBe2.0 strips were used to fabricate spiral tubes and actuators for controlled extension (STACERs) through the winding and stabilization method, which is a novel technique for obtaining STACERs. The raw strips and the STACERs were investigated using tensile tests and SEM for the mechanical propertie...
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MDPI AG
2023-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/20/6719 |
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| author | Ruilong Lu Jingtao Han Zhanhua Li Congfa Zhang Jiawei Liu Cheng Liu Zhenqian Lang Xiaoyan Ma |
| author_facet | Ruilong Lu Jingtao Han Zhanhua Li Congfa Zhang Jiawei Liu Cheng Liu Zhenqian Lang Xiaoyan Ma |
| author_sort | Ruilong Lu |
| collection | DOAJ |
| description | QBe2.0 strips were used to fabricate spiral tubes and actuators for controlled extension (STACERs) through the winding and stabilization method, which is a novel technique for obtaining STACERs. The raw strips and the STACERs were investigated using tensile tests and SEM for the mechanical properties and fractography observation, employing specialized test equipment for service performance, and via XRD, EBSD, and TEM were used to test the residual stress and microstructure evolution. The tensile strength/elongation for raw strips was 485.8 MPa/60%, while for STACERs, tensile strength increased by 834.67 MPa to 646 MPa, and the elongation rate decreased by 12% to 19.3%. The fractography showed that the fracture mode was ductile. The service performance tests indicated that STACERs obtained under 320 °C had a higher driving force, good pointing accuracy, and high bending stiffness, while the residual stress of raw strips was τ<sub>xy</sub> = −6 MPa; for STACERs obtained between 290 °C and 350 °C, τ<sub>xy</sub> decreased from −5 MPa to −74 MPa, then increased from −74 MPa to 21 MPa, and the optimum fabricating parameter was 320 °C + 2 h. The EBSD results showed that LABs and HABs for raw strips and STACERs at 320 °C + 2 h accounted for 3–97% and 24.5–75.5%, the grain sizes were 7.07 μm and 3.67 μm, and the twin fraction decreased from 57.3% to 31.8%, respectively. The KAM and Schmid factor maps indicated that the STACER was prone to recovering and recrystallizing. Coupled with the EBSD results, the TEM results indicated that the strengthening mechanism for raw strips is twinning strengthening, while that for STACER is grain-refining strengthening with a precipitation of the γ″ phase. It is a meaningful novelty that the relationship between the macro properties and microstructure has been elucidated. |
| first_indexed | 2024-03-10T21:05:56Z |
| format | Article |
| id | doaj.art-93ed0d456bdb491c908de55af5087e7e |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T21:05:56Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-93ed0d456bdb491c908de55af5087e7e2023-11-19T17:11:21ZengMDPI AGMaterials1996-19442023-10-011620671910.3390/ma16206719Study of the Mechanical Properties and Microstructure of Spiral Tubes and Actuators for Controlled Extension Fabricated with Beryllium Bronze StripsRuilong Lu0Jingtao Han1Zhanhua Li2Congfa Zhang3Jiawei Liu4Cheng Liu5Zhenqian Lang6Xiaoyan Ma7School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, ChinaInstitute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, ChinaSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaGuangzhou Sino Precision Steel Tube Industry Research Institute Co., Ltd., Guangzhou 511300, ChinaQBe2.0 strips were used to fabricate spiral tubes and actuators for controlled extension (STACERs) through the winding and stabilization method, which is a novel technique for obtaining STACERs. The raw strips and the STACERs were investigated using tensile tests and SEM for the mechanical properties and fractography observation, employing specialized test equipment for service performance, and via XRD, EBSD, and TEM were used to test the residual stress and microstructure evolution. The tensile strength/elongation for raw strips was 485.8 MPa/60%, while for STACERs, tensile strength increased by 834.67 MPa to 646 MPa, and the elongation rate decreased by 12% to 19.3%. The fractography showed that the fracture mode was ductile. The service performance tests indicated that STACERs obtained under 320 °C had a higher driving force, good pointing accuracy, and high bending stiffness, while the residual stress of raw strips was τ<sub>xy</sub> = −6 MPa; for STACERs obtained between 290 °C and 350 °C, τ<sub>xy</sub> decreased from −5 MPa to −74 MPa, then increased from −74 MPa to 21 MPa, and the optimum fabricating parameter was 320 °C + 2 h. The EBSD results showed that LABs and HABs for raw strips and STACERs at 320 °C + 2 h accounted for 3–97% and 24.5–75.5%, the grain sizes were 7.07 μm and 3.67 μm, and the twin fraction decreased from 57.3% to 31.8%, respectively. The KAM and Schmid factor maps indicated that the STACER was prone to recovering and recrystallizing. Coupled with the EBSD results, the TEM results indicated that the strengthening mechanism for raw strips is twinning strengthening, while that for STACER is grain-refining strengthening with a precipitation of the γ″ phase. It is a meaningful novelty that the relationship between the macro properties and microstructure has been elucidated.https://www.mdpi.com/1996-1944/16/20/6719STACERberyllium bronze (QBe2.0)deployable boommechanical propertiesmicrostructure |
| spellingShingle | Ruilong Lu Jingtao Han Zhanhua Li Congfa Zhang Jiawei Liu Cheng Liu Zhenqian Lang Xiaoyan Ma Study of the Mechanical Properties and Microstructure of Spiral Tubes and Actuators for Controlled Extension Fabricated with Beryllium Bronze Strips Materials STACER beryllium bronze (QBe2.0) deployable boom mechanical properties microstructure |
| title | Study of the Mechanical Properties and Microstructure of Spiral Tubes and Actuators for Controlled Extension Fabricated with Beryllium Bronze Strips |
| title_full | Study of the Mechanical Properties and Microstructure of Spiral Tubes and Actuators for Controlled Extension Fabricated with Beryllium Bronze Strips |
| title_fullStr | Study of the Mechanical Properties and Microstructure of Spiral Tubes and Actuators for Controlled Extension Fabricated with Beryllium Bronze Strips |
| title_full_unstemmed | Study of the Mechanical Properties and Microstructure of Spiral Tubes and Actuators for Controlled Extension Fabricated with Beryllium Bronze Strips |
| title_short | Study of the Mechanical Properties and Microstructure of Spiral Tubes and Actuators for Controlled Extension Fabricated with Beryllium Bronze Strips |
| title_sort | study of the mechanical properties and microstructure of spiral tubes and actuators for controlled extension fabricated with beryllium bronze strips |
| topic | STACER beryllium bronze (QBe2.0) deployable boom mechanical properties microstructure |
| url | https://www.mdpi.com/1996-1944/16/20/6719 |
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